Main bearing set 02/202911 Perkins RG standard, genuine

Main bearing set 02/202911, standard is a genuine JCB part for the Perkins 1104 (RG) engine. The card also lists U5MB0033, U5MB0018, T427334, 353-7423.

Main bearing shells are made of a steel back with an anti-friction lining. When the thin running layer wears through, the layer underneath shows, a sign of excess oil clearance and a reason to replace them. In an engine overhaul the main bearings are always renewed, whatever the state of the crankshaft. The shell size is marked on the back of each shell, showing standard or the undersize value.

Specifications

Compatibility

The part is listed for JCB machines fitted with these engines. In the Perkins catalogue this set is listed as U5MB0033 and U5MB0018 for 1104 series engines. The catalogue also has the aftermarket version (option 1) and aftermarket version (option 2) of this part. Other parts are in Perkins engine.

Fitting

Before assembly the main journals are measured with a micrometer and the oil clearance is checked with Plastigage. The shell locks go into their notches, the drilled shells go in the upper housings and the bolts are tightened in the JCB sequence and torque. The shells go in oiled; watch the oil pressure on first start.